Add description resource for cache store stores metric

The server-side metrics descriptors fail to load a key

14:44:59,931 ERROR [org.jboss.as.controller.management-operation] (HttpManagementService-threads - 1) JBAS014612: Operation ("read-resource") failed - address: ([

{"subsystem" => "infinispan"}

,

{"cache-container" => "clustered"}

,

{"distributed-cache" => "default"}

]): java.util.MissingResourceException: Can't find resource for bundle java.util.PropertyResourceBundle, key infinispan.distributed-cache.cache-loader-stores